Richard Jones, London Underground’s head of command and control, said: “Due to detailed planning there will be no visible impact on the network should the strike action go ahead.

“We remain committed to discussions with Unite, TSSA and RMT representatives around working terms and conditions for staff in our power control team.

“I urge them to continue with constructive discussions rather than threaten pointless industrial action.”

In May, a similar strike brought a warning from the Unite union that the Tube system would be crippled during the approaching weekend. In the end, services were unaffected.

Mick Cash RMT acting general secretary said: "This dispute is over an all-out attack on the power control grade that would hit pensions, length of service and working conditions and damage the futures of this key group of Tube workers.

"Management’s claim that they can run the system without them is both provocative and dangerous.

"These staff are effectively the national grid for London Underground and this action will have the most severe consequences for Tube operations but has been forced on us by management wrecking the earlier talks.

"We have a chance today to resolve the dispute but that means that the management side need to get out of their trenches and engage with us in the ACAS negotiations. "